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PDF A1340 Data sheet ( Hoja de datos )
| Número de pieza | A1340 | |
| Descripción | High Precision Programmable Linear Hall Effect Sensor IC | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A1340
High Precision Programmable Linear Hall Effect Sensor IC
with EEPROM, Analog Output, and Advanced Output Linearization
FEATURES AND BENEFITS
• Advanced 32-segment output linearization functionality
enables high output accuracy and linearity in the
presence of non-linear input magnetic fields
• Customer adjustable sensitivity and offset, bandwidth,
output clamps, and 1st and 2nd order temperature
compensation
• Simultaneous programming of all parameters for accurate
and efficient system optimization
• Factory trimmed magnetic input range (coarse sensitivity)
and signal offset
• Sensitivity temperature coefficient and magnetic offset drift
preset at Allegro, for maximum device accuracy without
requiring customer temperature testing
• Temperature-stable, mechanical stress immune, and
extremely low noise device output via proprietary
four-phase chopper stabilization and differential circuit
design techniques
• Diagnostics for open circuit and undervoltage
• Wide ambient temperature range: –40°C to 150°C
• Operates with 4.5 to 5.5 V supply voltage
Package: 4-pin SIP (suffix KT)
1 mm case thickness
DESCRIPTION
The A1340 device is a high precision, programmable Hall
effect linear sensor integrated circuit (IC) for both automotive
and non-automotive applications. The signal path of theA1340
provides flexibility through external programming that allows
the generation of an accurate, and customized output voltage
from an input magnetic signal. The A1340 provides 12 bits of
output resolution, and supports a maximum bandwidth of 3 kHz.
The BiCMOS, monolithic integrated circuit incorporates a
Hall sensor element, precision temperature-compensating
circuitry to reduce the intrinsic sensitivity and offset drift of the
Hall element, a small-signal high-gain amplifier, proprietary
dynamic offset cancellation circuits, and advanced output
linearization circuitry.
With on-board EEPROM and advanced signal processing
functions, theA1340 provides an unmatched level of customer
reprogrammable options for characteristics such as gain and
offset, bandwidth, and output clamps. Multiple input magnetic
range and signal offset choices can be preset at the factory. In
addition, the device supports separate hot and cold, 1st and 2nd
order temperature compensation.
A key feature of the A1340 is its ability to produce a highly
linear device output for nonlinear input magnetic fields.
To achieve this, the device divides the output into 32 equal
segments and applies a unique linearization coefficient factor
to each segment. Linearization coefficients are stored in a
look-up table in EEPROM.
The A1340 sensor is available in a lead (Pb) free 4-pin single
in-line package (KT suffix), with 100% matte tin leadframe
plating.
Not to scale
Analog Subsystem
...00110011...
Digital Signal Processing
Output Stage
Magnetic
Signal
12-bit
12-bit
Hall
Element
Factory Preset
Magnetic Range
and
Signal Offset
A to D
Conversion
Bandwidth
and
Temperature
Compensation
Sensitivity
and
Fine Offset
Adjustment
Linearization
Clamps
D to A
Output
Conversion Driver
Figure 1: A1340 Signal Processing Path.
Functions with programmable parameters indicated by double-headed arrows.
A1340-DS, Rev. 2
Output
Voltage
1 page  
A1340
High Precision Programmable Linear Hall Effect Sensor IC
with EEPROM, Analog Output, and Advanced Output Linearization
ELECTRICAL CHARACTERISTICS: valid through full operating temperature range, TA , and supply voltage, VCC ,
CBYPASS = 10 nF, unless otherwise specified
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit1
General Electrical Characteristics
Supply Voltage
Supply Current
Supply Zener Clamp Voltage
Hall Chopping Frequency4
Undervoltage Lockout Threshold2
Output Electrical Characteristics
VCC
ICC
VZSUPPLY TA = 25°C; ICC = ICC(max) + 3 mA
fC TA = 25°C
VCC(UV_low) TA = 25°C, UVLO falling
VCC(UV_high) TA = 25°C, UVLO rising
4.5 – 5.5 V
5 – 15 mA
19 – – V
– 128 – kHz
3.5 – 4.2 V
3.7 – 4.45 V
Output Saturation Voltage
Output Current Limit
Output Noise Peak to Peak3
Output Zener Clamp Voltage
Output Load Resistance4
Output Load Capacitance4,5
VSAT(H) ROUT = 10 kΩ to GND, VCC – VOUT ,TA = 25°C – 0.2 0.3 V
VSAT(L) ROUT = 10 kΩ to VCC, TA = 25°C
– 0.2 0.3 V
ILIMIT(SNK) VOUT = VCC(max), TA = 25°C
25 35 42 mA
ILIMIT(SRC) VOUT = GND, TA = 25°C
–4 –1.6
–
mA
Vnpp
– 6 – mVpp
VZOUT TA = 25°C
29 – – V
RLOAD VOUT to VCC, VOUT to GND
10 –
– kΩ
CLOAD VOUT to GND
– – 10 nF
BW = 3000 Hz
– 0.6 0.75 ms
Power-On Time4,6,7
tPO BW = 1500 Hz
BW = 375 Hz
– 1.1 1.4 ms
– 3.2 4.0 ms
BW = 3000 Hz
– 0.5 – ms
Response Time7,8
tRESP
BW = 1500 Hz
BW = 375 Hz
– 0.9 –
– 3.24 –
ms
ms
11 G (gauss) = 0.1 mT (millitesla).
2See Protection Features section.
3Capacitor of 10 nF connected between output and ground.
4Determined by design.
5Clarity of a Read Acknowledge message from the device to the controller will be affected by the amount of capacitance and wire inductance on the device output. In such
case, it is recommended to slow down the communication speed, and to lower the receiver threshold for reading digital Manchester signal to 1 V.
6Defined as time from VCC reaching VCC(min) to VOUT reaching 90% of its steady state. See Definitions of Terms section.
7Parameter is verified by lab characterization with a limited amount of samples.
8Defined time from step in gauss of applied magnetic field to VOUT step reaching 90% of its steady state. See Definitions of Terms section.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1340
High Precision Programmable Linear Hall Effect Sensor IC
with EEPROM, Analog Output, and Advanced Output Linearization
CHARACTERISTIC PERFORMANCE
Average Supply Current versus Supply Voltage
12.0
11.6
11.2
10.8
10.4
10.0
9.6
9.2
8.8
8.4
8.0
4.0
4.5 5.0 5.5
Supply Voltage, VCC (V)
TA (°C)
-40
-20
0
25
50
75
100
125
150
6.0
Average Supply Current (On) versus Temperature
12.0
11.6
11.2
VCC (V)
4.5
10.8
10.4
5.0
5.5
10.0
9.6
9.2
8.8
8.4
8.0
-60 -40 -20 0 20 40 60 80 100 120 140 160
Ambient Temperature, TA (°C)
Output Saturation Voltage (Low) versus
Average Supply Voltage
300
250
200
150
100
50
TA (°C)
-40
-20
0
25
50
75
100
125
150
0
4.0 4.5 5.0 5.5 6.0
Supply Voltage, VCC (V)
Output Saturation Voltage (Low) versus
Average Temperature
300
250
200
150
100
VCC (V)
4.5
5.0
5.5
50
0
-60 -40 -20 0 20 40 60 80 100 120 140 160
Ambient Temperature, TA (°C)
Output Saturation Voltage (High) versus
Average Supply Voltage
300
250
200
150
100
50
TA (°C)
-40
-20
0
25
50
75
100
125
150
0
4.0 4.5 5.0 5.5 6.0
Supply Voltage, VCC (V)
Output Saturation Voltage (High) versus
Average Temperature
300
250
200
150
100
VCC (V)
4.5
5.0
5.5
50
0
-60 -40 -20 0 20 40 60 80 100 120 140 160
Ambient Temperature, TA (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet A1340.PDF ] | |
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